/Engine/Source/Runtime/Engine/Classes/Kismet/KismetMathLibrary.h
Uses a simple spring model to interpolate a vector from Current to Target.
static FVector VectorSpringInterp ( FVector Current, FVector Target, [FVectorSpringState](API\Runtime\Engine\Kismet\FVectorSpringState) & SpringState, float Stiffness, float CriticalDampingFactor, float DeltaTime, float Mass, float TargetVelocityAmount, bool bClamp, FVector MinValue, FVector MaxValue, bool bInitializeFromTarget )